(Table S1) Tie-points used in age model construction for ODP Leg 172 sites
ix Ocean Drilling Program (ODP) sites, in the Northwest Atlantic have been used to investigate kinematic and chemical changes in the "Western Boundary Undercurrent" (WBUC) during the development of full glacial conditions across the Marine Isotope Stage 5a/4 boundary (~70,000 years ago). S...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.821830 2023-05-15T17:32:35+02:00 (Table S1) Tie-points used in age model construction for ODP Leg 172 sites Thornalley, David JR Barker, Stephen Becker, Julia Hall, Ian R Knorr, Gregor MEDIAN LATITUDE: 31.818153 * MEDIAN LONGITUDE: -72.244231 * SOUTH-BOUND LATITUDE: 29.975389 * WEST-BOUND LONGITUDE: -76.286278 * NORTH-BOUND LATITUDE: 33.686444 * EAST-BOUND LONGITUDE: -57.615000 * DATE/TIME START: 1997-02-21T00:00:00 * DATE/TIME END: 1997-03-25T00:00:00 * MINIMUM DEPTH, sediment/rock: 55.60 m * MAXIMUM DEPTH, sediment/rock: 85.30 m 2013-11-06 text/tab-separated-values, 140 data points https://doi.pangaea.de/10.1594/PANGAEA.821830 https://doi.org/10.1594/PANGAEA.821830 en eng PANGAEA Hoogakker, Babette A A; McCave, I Nick; Vautravers, Maryline J (2007): Antarctic link to deep flow speed variation during Marine Isotope Stage 3 in the western North Atlantic. Earth and Planetary Science Letters, 257(3-4), 463-473, https://doi.org/10.1016/j.epsl.2007.03.003 https://doi.pangaea.de/10.1594/PANGAEA.821830 https://doi.org/10.1594/PANGAEA.821830 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Thornalley, David JR; Barker, Stephen; Becker, Julia; Hall, Ian R; Knorr, Gregor (2013): Abrupt changes in deep Atlantic circulation during the transition to full glacial conditions. Paleoceanography, 28(2), 253-262, https://doi.org/10.1002/palo.20025 172-1055 172-1057 172-1059 172-1060 172-1061 172-1063 Age model Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Carolina Slope COMPCORE Composite Core DEPTH sediment/rock Elevation of event Event label Joides Resolution Latitude of event Leg172 Longitude of event Ocean Drilling Program ODP Tie point Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.821830 https://doi.org/10.1002/palo.20025 https://doi.org/10.1016/j.epsl.2007.03.003 2023-01-20T09:01:49Z ix Ocean Drilling Program (ODP) sites, in the Northwest Atlantic have been used to investigate kinematic and chemical changes in the "Western Boundary Undercurrent" (WBUC) during the development of full glacial conditions across the Marine Isotope Stage 5a/4 boundary (~70,000 years ago). Sortable silt mean grain size(sort s) measurements are employed to examine changes in near bottom flow speeds, together with carbon isotopes measured in benthic foraminifera and % planktic foraminiferal fragmentation as proxies for changes in water-mass chemistry. A depth transect of cores, spanning 1.8-4.6 km depth, allows changes in both the strength and depth of the WBUC to be constrained across millennial scale events. Sort s measurements reveal that the flow speed structure of the WBUC during warm intervals ("interstadials") was comparable to modern (Holocene) conditions. However, significant differences are observed during cold intervals, with higher relative flow speeds inferred for the shallow component of the WBUC (~2 km depth) during all cold "stadial" intervals (including Heinrich Stadial 6), and a substantial weakening of the deep component (~3-4 km) during full glacial conditions. Our results therefore reveal that the onset of full glacial conditions was associated with a regime shift to a shallower mode of circulation (involving Glacial North Atlantic Intermediate Water) that was quantitatively distinct from preceding cold stadial events. Furthermore, our chemical proxy data show that the physical response of the WBUC during the last glacial inception was probably coupled to basin-wide changes in the water-mass composition of the deep Northwest Atlantic. Dataset North Atlantic Northwest Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-76.286278,-57.615000,33.686444,29.975389) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
172-1055 172-1057 172-1059 172-1060 172-1061 172-1063 Age model Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Carolina Slope COMPCORE Composite Core DEPTH sediment/rock Elevation of event Event label Joides Resolution Latitude of event Leg172 Longitude of event Ocean Drilling Program ODP Tie point |
spellingShingle |
172-1055 172-1057 172-1059 172-1060 172-1061 172-1063 Age model Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Carolina Slope COMPCORE Composite Core DEPTH sediment/rock Elevation of event Event label Joides Resolution Latitude of event Leg172 Longitude of event Ocean Drilling Program ODP Tie point Thornalley, David JR Barker, Stephen Becker, Julia Hall, Ian R Knorr, Gregor (Table S1) Tie-points used in age model construction for ODP Leg 172 sites |
topic_facet |
172-1055 172-1057 172-1059 172-1060 172-1061 172-1063 Age model Blake-Bahama Outer Ridge North Atlantic Ocean Blake Outer Ridge Carolina Slope COMPCORE Composite Core DEPTH sediment/rock Elevation of event Event label Joides Resolution Latitude of event Leg172 Longitude of event Ocean Drilling Program ODP Tie point |
description |
ix Ocean Drilling Program (ODP) sites, in the Northwest Atlantic have been used to investigate kinematic and chemical changes in the "Western Boundary Undercurrent" (WBUC) during the development of full glacial conditions across the Marine Isotope Stage 5a/4 boundary (~70,000 years ago). Sortable silt mean grain size(sort s) measurements are employed to examine changes in near bottom flow speeds, together with carbon isotopes measured in benthic foraminifera and % planktic foraminiferal fragmentation as proxies for changes in water-mass chemistry. A depth transect of cores, spanning 1.8-4.6 km depth, allows changes in both the strength and depth of the WBUC to be constrained across millennial scale events. Sort s measurements reveal that the flow speed structure of the WBUC during warm intervals ("interstadials") was comparable to modern (Holocene) conditions. However, significant differences are observed during cold intervals, with higher relative flow speeds inferred for the shallow component of the WBUC (~2 km depth) during all cold "stadial" intervals (including Heinrich Stadial 6), and a substantial weakening of the deep component (~3-4 km) during full glacial conditions. Our results therefore reveal that the onset of full glacial conditions was associated with a regime shift to a shallower mode of circulation (involving Glacial North Atlantic Intermediate Water) that was quantitatively distinct from preceding cold stadial events. Furthermore, our chemical proxy data show that the physical response of the WBUC during the last glacial inception was probably coupled to basin-wide changes in the water-mass composition of the deep Northwest Atlantic. |
format |
Dataset |
author |
Thornalley, David JR Barker, Stephen Becker, Julia Hall, Ian R Knorr, Gregor |
author_facet |
Thornalley, David JR Barker, Stephen Becker, Julia Hall, Ian R Knorr, Gregor |
author_sort |
Thornalley, David JR |
title |
(Table S1) Tie-points used in age model construction for ODP Leg 172 sites |
title_short |
(Table S1) Tie-points used in age model construction for ODP Leg 172 sites |
title_full |
(Table S1) Tie-points used in age model construction for ODP Leg 172 sites |
title_fullStr |
(Table S1) Tie-points used in age model construction for ODP Leg 172 sites |
title_full_unstemmed |
(Table S1) Tie-points used in age model construction for ODP Leg 172 sites |
title_sort |
(table s1) tie-points used in age model construction for odp leg 172 sites |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.821830 https://doi.org/10.1594/PANGAEA.821830 |
op_coverage |
MEDIAN LATITUDE: 31.818153 * MEDIAN LONGITUDE: -72.244231 * SOUTH-BOUND LATITUDE: 29.975389 * WEST-BOUND LONGITUDE: -76.286278 * NORTH-BOUND LATITUDE: 33.686444 * EAST-BOUND LONGITUDE: -57.615000 * DATE/TIME START: 1997-02-21T00:00:00 * DATE/TIME END: 1997-03-25T00:00:00 * MINIMUM DEPTH, sediment/rock: 55.60 m * MAXIMUM DEPTH, sediment/rock: 85.30 m |
long_lat |
ENVELOPE(-76.286278,-57.615000,33.686444,29.975389) |
genre |
North Atlantic Northwest Atlantic |
genre_facet |
North Atlantic Northwest Atlantic |
op_source |
Supplement to: Thornalley, David JR; Barker, Stephen; Becker, Julia; Hall, Ian R; Knorr, Gregor (2013): Abrupt changes in deep Atlantic circulation during the transition to full glacial conditions. Paleoceanography, 28(2), 253-262, https://doi.org/10.1002/palo.20025 |
op_relation |
Hoogakker, Babette A A; McCave, I Nick; Vautravers, Maryline J (2007): Antarctic link to deep flow speed variation during Marine Isotope Stage 3 in the western North Atlantic. Earth and Planetary Science Letters, 257(3-4), 463-473, https://doi.org/10.1016/j.epsl.2007.03.003 https://doi.pangaea.de/10.1594/PANGAEA.821830 https://doi.org/10.1594/PANGAEA.821830 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.821830 https://doi.org/10.1002/palo.20025 https://doi.org/10.1016/j.epsl.2007.03.003 |
_version_ |
1766130784648822784 |